An FIU board multiplexes and demultiplexes signals the main optical path and OSC signals. The RC port of the FIU board receives signals from the main optical path and the RM port receives signals from the OSC. The two types of signals are then multiplexed into one signal using the multiplexer module and are output from the OUT port. The IN port receives signals from the line and then sends the signals to the demultiplexer module. The demultiplexing module splits the signals into main optical path signals and OSC signals, which are then output through the TC and TM ports respectively.
This board has a total of 7 physical ports, their role is shown below:
Interface Type Function
|
IN |
LC |
Receives the line signal. |
|
OUT |
LSH/APC |
Transmits the line signal. |
|
TC |
LC |
Transmits the main path signal. |
|
RC |
LSH/APC |
Receives the main path signal. |
|
TM |
LC |
Transmits the optical supervisory channel signal. |
|
RM |
LC |
Receives the optical supervisory channel signal. |
|
MON |
LC
|
Connects to TN97OPM8, for in-service monitoring of the signals routed to the OUT port. the ratio of the MON port power to the OUT port power is 0.1:99.9. In other words, the MON port power is 30 dB less than the actual signal power calculated as follows: Pout (dBm) - Pmon (dBm) = 10 x lg (99.9/0.1) = 30 dB. |